FreeBSD/Linux Kernel Cross Reference
sys/kern/exec_ecoff.c
1 /* $NetBSD: exec_ecoff.c,v 1.26 2005/12/11 12:24:29 christos Exp $ */
2
3 /*
4 * Copyright (c) 1994 Adam Glass
5 * Copyright (c) 1993, 1994, 1996, 1999 Christopher G. Demetriou
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by Christopher G. Demetriou
19 * for the NetBSD Project.
20 * 4. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35 #include <sys/cdefs.h>
36 __KERNEL_RCSID(0, "$NetBSD: exec_ecoff.c,v 1.26 2005/12/11 12:24:29 christos Exp $");
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/proc.h>
41 #include <sys/malloc.h>
42 #include <sys/vnode.h>
43 #include <sys/exec.h>
44 #include <sys/resourcevar.h>
45
46 #include <sys/exec_ecoff.h>
47
48 /*
49 * exec_ecoff_makecmds(): Check if it's an ecoff-format executable.
50 *
51 * Given a proc pointer and an exec package pointer, see if the referent
52 * of the epp is in ecoff format. Check 'standard' magic numbers for
53 * this architecture. If that fails, return failure.
54 *
55 * This function is responsible for creating a set of vmcmds which can be
56 * used to build the process's vm space and inserting them into the exec
57 * package.
58 */
59 int
60 exec_ecoff_makecmds(struct lwp *l, struct exec_package *epp)
61 {
62 int error;
63 struct ecoff_exechdr *execp = epp->ep_hdr;
64
65 if (epp->ep_hdrvalid < ECOFF_HDR_SIZE)
66 return ENOEXEC;
67
68 if (ECOFF_BADMAG(execp))
69 return ENOEXEC;
70
71 error = (*epp->ep_esch->u.ecoff_probe_func)(l, epp);
72
73 /*
74 * if there was an error or there are already vmcmds set up,
75 * we return. (the latter can happen if cpu_exec_ecoff_hook()
76 * recursively invokes check_exec() to handle loading of a
77 * dynamically linked binary's shared loader.
78 */
79 if (error || epp->ep_vmcmds.evs_cnt)
80 return (error);
81
82 /*
83 * prepare the exec package to map the executable.
84 */
85 switch (execp->a.magic) {
86 case ECOFF_OMAGIC:
87 error = exec_ecoff_prep_omagic(l, epp, epp->ep_hdr,
88 epp->ep_vp);
89 break;
90 case ECOFF_NMAGIC:
91 error = exec_ecoff_prep_nmagic(l, epp, epp->ep_hdr,
92 epp->ep_vp);
93 break;
94 case ECOFF_ZMAGIC:
95 error = exec_ecoff_prep_zmagic(l, epp, epp->ep_hdr,
96 epp->ep_vp);
97 break;
98 default:
99 return ENOEXEC;
100 }
101
102 /* set up the stack */
103 if (!error)
104 error = (*epp->ep_esch->es_setup_stack)(l, epp);
105
106 if (error)
107 kill_vmcmds(&epp->ep_vmcmds);
108
109 return error;
110 }
111
112 /*
113 * exec_ecoff_prep_omagic(): Prepare a ECOFF OMAGIC binary's exec package
114 */
115 int
116 exec_ecoff_prep_omagic(struct lwp *l, struct exec_package *epp,
117 struct ecoff_exechdr *execp, struct vnode *vp)
118 {
119 struct ecoff_aouthdr *eap = &execp->a;
120
121 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start);
122 epp->ep_tsize = eap->tsize;
123 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start);
124 epp->ep_dsize = eap->dsize + eap->bsize;
125 epp->ep_entry = eap->entry;
126
127 /* set up command for text and data segments */
128 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
129 eap->tsize + eap->dsize, epp->ep_taddr, vp,
130 ECOFF_TXTOFF(execp),
131 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
132
133 /* set up command for bss segment */
134 if (eap->bsize > 0)
135 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize,
136 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0,
137 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
138
139 return 0;
140 }
141
142 /*
143 * exec_ecoff_prep_nmagic(): Prepare a 'native' NMAGIC ECOFF binary's exec
144 * package.
145 */
146 int
147 exec_ecoff_prep_nmagic(struct lwp *l, struct exec_package *epp,
148 struct ecoff_exechdr *execp, struct vnode *vp)
149 {
150 struct ecoff_aouthdr *eap = &execp->a;
151
152 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start);
153 epp->ep_tsize = eap->tsize;
154 epp->ep_daddr = ECOFF_ROUND(eap->data_start, ECOFF_LDPGSZ);
155 epp->ep_dsize = eap->dsize + eap->bsize;
156 epp->ep_entry = eap->entry;
157
158 /* set up command for text segment */
159 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_tsize,
160 epp->ep_taddr, vp, ECOFF_TXTOFF(execp),
161 VM_PROT_READ|VM_PROT_EXECUTE);
162
163 /* set up command for data segment */
164 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_dsize,
165 epp->ep_daddr, vp, ECOFF_DATOFF(execp),
166 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
167
168 /* set up command for bss segment */
169 if (eap->bsize > 0)
170 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize,
171 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0,
172 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
173
174 return 0;
175 }
176
177 /*
178 * exec_ecoff_prep_zmagic(): Prepare a ECOFF ZMAGIC binary's exec package
179 *
180 * First, set the various offsets/lengths in the exec package.
181 *
182 * Then, mark the text image busy (so it can be demand paged) or error
183 * out if this is not possible. Finally, set up vmcmds for the
184 * text, data, bss, and stack segments.
185 */
186 int
187 exec_ecoff_prep_zmagic(struct lwp *l, struct exec_package *epp,
188 struct ecoff_exechdr *execp, struct vnode *vp)
189 {
190 struct ecoff_aouthdr *eap = &execp->a;
191 int error;
192
193 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start);
194 epp->ep_tsize = eap->tsize;
195 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start);
196 epp->ep_dsize = eap->dsize + eap->bsize;
197 epp->ep_entry = eap->entry;
198
199 error = vn_marktext(vp);
200 if (error)
201 return (error);
202
203 /* set up command for text segment */
204 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->tsize,
205 epp->ep_taddr, vp, ECOFF_TXTOFF(execp),
206 VM_PROT_READ|VM_PROT_EXECUTE);
207
208 /* set up command for data segment */
209 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->dsize,
210 epp->ep_daddr, vp, ECOFF_DATOFF(execp),
211 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
212
213 /* set up command for bss segment */
214 if (eap->bsize > 0)
215 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize,
216 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0,
217 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
218
219 return 0;
220 }
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